Propane powered Ford - authentic or completely modified

[kquinton]

I recently purchased a Ford Tractor from a auction. After researching the model # (b1123c) and serial number (c331057), I concluded this to be a 1972 Ford 2000, LCG, Live 540 PTO, 8 speed (if I am wrong let me know). However, the model number indicates gas tractor but this one has a propane driven engine. Is this tractor I bought a completely modified tractor (gas to propane), or partially modified (original propane to modern propane tank), or is there a problem with my ID plate? Also it was painted yellow like it was Industrial? Is this correct? Picture of tractor and ID plate are attached.

 

[Soundguy]

it's gonna be hard to follow this thread as it appears in so many forums.